Tire-mold



mg g?) 7 Z 18 H. H FORREST.

TiRE MOLD.

Patented Aug. 5, 1919.

2 EEEEEEEEEEEE I IN VEN TOR.

A TTORNE YJ.

H. H. FORREST.

TIRE MGM).

.uwumnou F |LU MAR, 29, I919.

. Patented Aug. 5,1919.

2 SHEETS-SHIT 2.

j fg filsf n 1 5 M fi WI TNESS TTORNE Y5.

nown'xm K. ronassr, 0F KENT, 0x10.

TIRE-MOLD.

To all whom it may concern Be it known that I, Hownnu H. Fomms'r, a citizen of the United States, residing at Kent, in thecounty of Portage and State of Ohio, have invented certain new and useful Improvements in Tire-Molds; and I do hereby declare the followingto be a full, clean;

and exact description of the invention, such as will enable others skilled in the art to whiclnitappcrtains to make and use the same. A Thepresent invention relates generally to mo ds for-curing pneumatic tire casings, and aims to provide new and useful improvements in such molds using an air bag,

in order to overcome certain objections incident to the use of the ordinary air bags, and to obtain greater eihclency and an increased number of 'cnres.

In the air bag mold heretofore used, the air bag is of a cross section tolit within the tire casing, and considerable diliiculty has ensued by the use of such bags, due to the pinching of the'bag, the tipping of the beads of the casing, and the like. The present air bags also result in roughness on the inside of the beads at the heel, and injuries to the apparatus and workmen sometimes result due to the premature application of air.

The present construction is such that the foregoing and other objections are overcome by the revision of aspecial ringbetween the sections of the mold and around which the air bag is dis osed,-so that said ring will avoid all possi ilitics of the air bag be. ing pinched, and will alsoprovidc for the erfect formation of the beads of the dosmg, as well as providing for safety to the workmen. because air is notapplied until the ringing up is completed. This ring also enables the air bag to be of circular cross section, without square or angular corners as in the ordinary air bag, thus permitting the sections of the mold to seat perfectly without the liability of the bag becoming pinched or slipping down,

With the foregoing and other objects in view which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts here inafter described and claimed, it being understood thetchangcs can be made within the scope of what is claimed without departing from the spirit of ti invention.

Specification of Letters Patent.

application filed March 29, 1919. Serial No. 255,9(12.

Pate ted Aug. 5, 1919.

The invention is illustrated in the accompanying clraw1ngs,-where1n:-5-

Figure 1 1s a cross section of the mold showing the air bag ring and the air bang thereon.

Fig. 2 is an elevation of the airbag ring. Fig. 3 is a diametrical'section thereof.

The tire casing mold llis of conventional form, as illustrated, comprising the side sections'Q having the confrontingrecesses 3 conforming to the side walls andftread of the tire casing. Thesections 1 have the slip joint 4 outside ofth'erecesses 3, and suitable fastening meansfi to clamp said sections together, and at the inner sides of the recesses 3, the sections 2 have the shoulders 6, be-

tween which; isdisposed 'the inner. mold member comprisingthe sections 7 having their opposite edges formed, as at 8, tofit the shoulder (3. These sections 7 have the recesses 9 to form the exterior surfaces of the beads of the casing (two different styles bein% illustrated). n carrying out the invention, there is disposed bctwccn the sections 7, which are spaced apart, an air bag ring 10 which is suitably divided into several sections to facilitate assemblage. As shown, the ring 10 is divided on radial lines, as at 11, between sections 12 and 13, as seen iii-Fig. 2, and is divided on chordal parallel lines 14 between the sections 13 and a fourth section 15 which can be readily moved outwardly into place between the sections 13. The opposite sides of the ring, 10 are provided with annular grooves 17 to receive the annular ribs 18 with which the adjacent sides of the mold sections 7 are provided, thereby retaining the ring 10 in fixed position in the mold, and the mold sections 7 and ring 10 have apertures 1G for the reception of belts or other means for clamping the parts together.

The outer edge of the ring 10 has a seat. 1!) extimding outwardly into the cavity or chamber of the mold, as seen in Fig. l, and the eircluuference of the seat 19 is concavcd transversely while the sides of the seat 19 diverge to provide the lips 20 overhanging: the mold sections 7. These lips 20 are shaped to conform to the inner sides of the beads provision of the seat 19, can be of circular cross section, as seen in Fig. 1, to snugly fit the seat 19 and lips 20. The ring 10 is rovided with a radial bore 22 through w ich the inflating nipple of the bag 21 can extend. With this construction, the air bag does not extend downwardly between the beads of the casing, and will not be pinched or displaced, while the lips'20 with the mold sections 7 will form perfect beads.

Havin thus described the invention, what is claimed as new is 1. A tire casing mold embodying side sections to conform to the sides of a tire casing, inner sections fitting the side sections having portions to conform to the exterior of the casing beads, a ring between said inner sections and having a portion projecting into the mold therefrom and formed to conform to the inner sides of the beads, and an air bag on said portion of .the rin 2. A tire casing mold embo tions to conform tothe sides of a tire casing,

a pair ofinner sections fitting the side sections having portions to conform to the extenor surfaces of the'casmg heads, a ring between said inner sect ons havinge portion ying side sec- 4 projecting within the mold and provided at opposite sides with diverging lips overhangin said sections to conform to the inner si es of the beads, and an air bag seating against said portion between said lips.-

3. A tire casing mold embodying side sections to conform to the sides of a tire a pair of inner mold sections fitting the si e sections having portions to conform to the exterior surfaces of the casing beads, a sectional ring between said inner mold sections and having an air bag seat projecting therefrom into the mold, said seat haying lips at opposite sides diver 'ng from one another and conforming to e inner sides of the casin beads,.said seat'bein concaved transverselyv an an air bag of circular between said lips,

against sa d seat between cross section seated said lips.

In testimony-whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HOWARD H. FORREST.

Witnesses:

Nrmn McKIesnN, BLAKE C. COOK. 

